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//
// AutoGrid.m
// SafetyDance
//
// Created by Nicholas Allegra on 1/26/15.
// Copyright (c) 2015 Nicholas Allegra. All rights reserved.
//
#import "AutoGrid.h"
@implementation AutoGrid
- (void)setViews:(NSArray *)_views {
views = _views;
[scrollView removeFromSuperview];
scrollView = [[UIScrollView alloc] init];
[self addSubview:scrollView];
for (UIView *view in views)
[scrollView addSubview:view];
[self setNeedsLayout];
}
- (void)layoutSubviews {
scrollView.frame = self.bounds;
CGFloat paddingX = 22, paddingY = 10;
NSUInteger nviews = [views count];
CGSize *sizes = malloc(sizeof(*sizes) * nviews);
for (NSUInteger i = 0; i < nviews; i++)
sizes[i] = [[views objectAtIndex:i] intrinsicContentSize];
CGFloat availableWidth = self.bounds.size.width;
/* try to lay out using an increasing number of columns */
NSUInteger cols;
CGSize contentSize;
CGFloat *colWidths = NULL;
for (cols = 1; ; cols++) {
free(colWidths);
colWidths = malloc(sizeof(*colWidths) * cols);
for (NSUInteger col = 0; col < cols; col++)
colWidths[col] = 0;
CGFloat tentativeHeight = 0;
CGFloat tentativeWidth = 0;
for (NSUInteger row = 0; row < nviews / cols; row++) {
CGFloat totalWidth = 0;
CGFloat maxHeight = 0;
for (NSUInteger col = 0; col < cols; col++) {
NSUInteger i = row * cols + col;
if (i >= nviews)
goto done1;
CGSize size = sizes[i];
if (size.width > colWidths[col])
colWidths[col] = size.width;
if (col != 0)
totalWidth += paddingX;
totalWidth += size.width;
if (size.height > maxHeight)
maxHeight = size.height;
}
if (totalWidth > tentativeWidth)
tentativeWidth = totalWidth;
tentativeHeight += maxHeight + paddingY;
}
done1:
if (cols > 1 && tentativeWidth > availableWidth) {
cols--;
break;
}
contentSize = CGSizeMake(tentativeWidth, tentativeHeight);
NSLog(@"%f", contentSize.height);
if (contentSize.width == 0)
break;
}
scrollView.contentSize = contentSize;
CGFloat y = 0;
for (NSUInteger row = 0; ; row++) {
CGFloat x = 0;
CGFloat maxHeight = 0;
for (NSUInteger col = 0; col < cols; col++) {
NSUInteger i = row * cols + col;
if (i >= nviews)
goto done2;
CGSize size = sizes[i];
UIView *view = [views objectAtIndex:i];
if (col != 0)
x += paddingX;
view.frame = CGRectMake(x, y, size.width, size.height);
x += colWidths[col];
if (size.height > maxHeight)
maxHeight = size.height;
}
y += maxHeight + paddingY;
}
done2:
free(sizes);
free(colWidths);
}
/*
// Only override drawRect: if you perform custom drawing.
// An empty implementation adversely affects performance during animation.
- (void)drawRect:(CGRect)rect {
// Drawing code
}
*/
@end
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